Breathing zone and exhaled air re-inhalation rate under transient conditions assessed with a computer-simulated person

Kazuki Kuga, Pawel Wargocki, Kazuhide Ito

研究成果: ジャーナルへの寄稿学術誌査読

抄録

The breathing zone of an individual indoors is usually defined as a finite region steadily formed in front of a face. Assuming the steady formation of the breathing zone, we propose a procedure for quantitatively identifying a breathing zone formed in front of a human face in the transient condition. This assumption is reasonable considering that the ventilation time scale of human respiration is sufficiently short compared to the ventilation time scale of a room. We used steady-state computational fluid dynamics (CFD) and a computationally simulated person (CSP). We present the probabilistic size of the breathing zone for various postures and breathing conditions. By analyzing unsteady inhalation and exhalation airflow characteristics via a CSP with a respiratory system, we also estimated the direct re-inhalation rate of the exhaled air. The results can be used for developing methods to control the long-term and low-contaminant concentration exposures.

本文言語英語
論文番号e13003
ジャーナルIndoor Air
32
2
DOI
出版ステータス出版済み - 2月 2022

!!!All Science Journal Classification (ASJC) codes

  • 環境工学
  • 建築および建設
  • 公衆衛生学、環境および労働衛生

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